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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9acd24be9a25fb7744d61a7aaba43cd492c8a9cd33003bf6e9676e2ef89b0c' 
  AND token = 'Td6rGLYL/kvfEHXR8MCGg1OGQezG5PRaomU+4H0/xRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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