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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937e6f8bbea35231652dd6535e020aa6c9fee7503965eed3e08b0d03837d52bf' 
  AND token = 'CbNmdFeZII/jgtj9U0Fx04+px0wDGp8WR3OPQfFLIgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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