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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512f9136b282e1cc58276587ec440052cbc213979be93085b3ff2de7940ba042' 
  AND token = 'Lp13ffE5X9mYvcUuylxW3HO4ASMAJR1jR8LpY6iCliw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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