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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b51969f183c74b40f70dbf58c7f7e9c3114e35e7a2ce583b33426fc2707520' 
  AND token = '0F0MfxghsgcchqmbKtikrHIR/Xdf1/FbxzbP/2W3Fvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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