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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a1928b408810d3d58ce75554707625cf55070df38bf9fb07c691f2a0b2641f' 
  AND token = '+nksPc9CDK854sU6t/SYodNpFe0vtOrz3Id5v1CwUP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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