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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6067aec53134518e1de431352cabe5926fa1c429ea0c97d1e2d1f7630f85436' 
  AND token = 'rQl039V6azrF6Rtrq7NQf4d2H9k9EcNhnkkWrHTRR1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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