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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2403b14e5db064c8c60aadfd1e790ba69bac19c9b07b4efabebb9989e77c70' 
  AND token = 'Nv4mda0Ng4W7YhUTRJksglU7p39oPQ12UkC4ywKKzLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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