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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19003409cce6c81217c17a1c33c7ab4b314da2d025f2ad52ff1cac4ed92d443' 
  AND token = 'n3aBDcNtSY/agem9H7FfF5H6L3/ZtL5GN0J2h5NDS7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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