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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fc6ee29d0a54e68aad7045bab4b89fd23cc23129eda0b5591f2250b5f28025' 
  AND token = 'Nr+w+C0cbHhlE4mcENzl+CgcGxeSNzBN1zRl1ylUMiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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