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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929ccdfbc38d0779ae0b7102521a7a2e583535c3aac544f25e0f3c8b3c1aab9e' 
  AND token = '5bfMGtBINtlYdyA3mxW07U2hruzNUvs3I6GNQY9NRTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}