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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030e2a17c2bfcee2f0061b3f77e6c54deb48aee0b408d01de0edfa533372f6ca' 
  AND token = 'd3nD0oku/CLDt8CX3jjQK4k/+rKcK7xri47BrfE8mVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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