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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'defb80d4f0195e7f437e47088ae31e0b3aeb31e588f6acdd45a853663c270932' 
  AND token = 'KdrWctgIyWkQSBVHy2B9M1U+IHewd5ysaA+ho0aQJ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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