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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed77d3087ae42db0c6bc1a14371fa580af18388956344264aa0c3aaff7c0d6a7' 
  AND token = 'Ux8Hfo6OVqOI5yvHI8wY0sy42k34i7dHFKno29ZN2qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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