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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce0e30d3dc965991d64daa920967ca73cfcf6165109e130dceaee1bad15607d' 
  AND token = '/My19YGEDaVXA5ZQxzwKux1rs1/q2Jal9u6qXwULCW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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