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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e7552f42929b30b845af441494bb59c4f1db6b7011b7bf773b3487fcb4d02c' 
  AND token = '5U4HjdymYC1UDuexOgno4Y9juUIoWVfhpFVBZWWYLsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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