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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b7c17b905fe860de2759620b9a9a16f4b0ce78928bdcf732fefeae48300aa0' 
  AND token = 'K1+34+RzRdvHwA3obtfD06uFPfF2TSR4T71p5lMbJBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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