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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8da97a0e2aa34c5c1744253980aae03d9ae6950a1e1cbb658f42369336b9bc' 
  AND token = 'v7G4FSbWLnBh96V6OoKafHem1y9kk/D5U4dfIsjYDNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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