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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3afb26c44cdbe3144e50d44935ee87fc89d359d0d079369cfa1335edddd750d' 
  AND token = 'BmN2pVVQK+26zn0SxVZ/b1qznk+DY+CVSMiAlPrKiCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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